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Ipomoea tricolor
This certainly is NOT Ipomoea tricolor because it has no yellow in the tube and the flower looks too small...
The species is either Ipomoea hederacea or Ipomoea nil and unfortunately because there are no sepals visible , the distinction between the 2 species cannot be made...by anyone.,..
Ipomoea nil
http://en.wikipedia.org/wiki/Ipomoea_nil...
Flowering season exact when you caught this. October-November.